[#bsl-unordered_set-0d2d-count-0ca]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-0d2d.adoc[unordered_set]::count
:relfileprefix: ../../
:mrdocs:

Return the number of elements equivalent to `key`.

== Synopses

Declared in `<bslstl_unorderedset.h>`

Return the number of elements equivalent to `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-0d2d/size_type.adoc[unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::size_type]
xref:bsl/unordered_set-0d2d/count-03.adoc[count](xref:bsl/unordered_set-0d2d/key_type.adoc[key_type] const& key) const;
----

[.small]#xref:bsl/unordered_set-0d2d/count-03.adoc[_» more..._]#

Return the number of elements equivalent to `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
xref:bsl/unordered_set-0d2d/size_type.adoc[size_type]
xref:bsl/unordered_set-0d2d/count-0c5.adoc[count](LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

[.small]#xref:bsl/unordered_set-0d2d/count-0c5.adoc[_» more..._]#

== Return Value

`0` or `1`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key value to look up
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#